package com.rh.users.config;

import org.springframework.aop.Advisor;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.interceptor.*;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;


@Configuration
public class TransactionAdviceConfig2 {

    private static final int TX_METHOD_TIMEOUT = 60;

    private static final String AOP_POINTCUT_EXPRESSION = "execution(* com.rh.users.service.*.*(..))";
    @Autowired
    private PlatformTransactionManager transactionManager;
/*
    @Autowired
    private DataSource dataSource; //此处与原文不同，框架默认会启动PlatformTransactionManager，如果自定义了dataSource的bean，可以此处自动注入
*/
/*    @Bean("txmanager")
    public DataSourceTransactionManager txManager() {
        DataSourceTransactionManager man = new DataSourceTransactionManager();
        man.setDataSource(dataSource);
        return man;
    }*/

    @Bean("txAdvice")
    public TransactionInterceptor txAdvice() {
        /*只读事物、不做更新删除等*/
        /*当前存在事务就用当前的事务，当前不存在事务就创建一个新的事务*/
        RuleBasedTransactionAttribute readOnlyRule = new RuleBasedTransactionAttribute();
        /*设置当前事务是否为只读事务，true为只读*/
        readOnlyRule.setReadOnly(true);
        /* transactiondefinition 定义事务的隔离级别；
         * PROPAGATION_NOT_SUPPORTED事务传播级别5，以非事务运行，如果当前存在事务，则把当前事务挂起*/
        readOnlyRule.setPropagationBehavior(TransactionDefinition.PROPAGATION_NOT_SUPPORTED);
        RuleBasedTransactionAttribute requireRule = new RuleBasedTransactionAttribute();
        /*抛出异常后执行切点回滚*/
        requireRule.setRollbackRules(Collections.singletonList(new RollbackRuleAttribute(Exception.class)));
        /*PROPAGATION_REQUIRED:事务隔离性为1，若当前存在事务，则加入该事务；如果当前没有事务，则创建一个新的事务。这是默认值。 */
        requireRule.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
        /*设置事务失效时间，如果超过5秒，则回滚事务*/
        requireRule.setTimeout(TX_METHOD_TIMEOUT);
        Map<String, TransactionAttribute> txMap = new HashMap<>();
        txMap.put("add*", requireRule);
        txMap.put("save*", requireRule);
        txMap.put("insert*", requireRule);
        txMap.put("update*", requireRule);
        txMap.put("delete*", requireRule);
        txMap.put("remove*", requireRule);

        txMap.put("get*", readOnlyRule);
        txMap.put("query*", readOnlyRule);
        txMap.put("find*", readOnlyRule);
        txMap.put("select*", readOnlyRule);
        /*事务管理规则，声明具备事务管理的方法名*/
        NameMatchTransactionAttributeSource source = new NameMatchTransactionAttributeSource();
        source.setNameMap(txMap);
        return new TransactionInterceptor(transactionManager, source);
    }

    @Bean
    public Advisor txAdviceAdvisor() {
        AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
        pointcut.setExpression(AOP_POINTCUT_EXPRESSION);
        return new DefaultPointcutAdvisor(pointcut, txAdvice());
    }
}

